64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
#pragma once
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#include <stdint.h>
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#include "debug/debug.h"
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#include "memory/user_stack_manager.h"
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// VirtualMemory class holds a memory space for an individual process.
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//
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// Memory Regions are predefined for simplicity for now. However, in general
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// we try not to rely on these regions being static to allow for flexibility in
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// the future.
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//
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// User Regions (Per Process):
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// 0x00000000 00000000 - 0x0000000F FFFFFFFF : USER_CODE (64 GiB)
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// 0x00000010 00000000 - 0x0000001F FFFFFFFF : USER_HEAP (64 GiB)
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// 0x00000020 00000000 - 0x0000002F FFFFFFFF : MEM_MAP (64 GiB)
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// 0x00000040 00000000 - 0x0000004F FFFFFFFF : IPC_BUF (64 GiB)
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// 0x00007FF0 00000000 - 0x00007FFF FFFFFFFF : USER_STACK (64 GiB)
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//
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// Kernel Regions (Shared across processes):
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// 0xFFFF8000 00000000 - 0xFFFF800F FFFFFFFF : HHDM (64 GiB)
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// 0xFFFFFFFF 40000000 - 0xFFFFFFFF 7FFFFFFF : KERNEL_HEAP (1 GiB)
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// 0xFFFFFFFF 80000000 - 0xFFFFFFFF 80FFFFFF : KERNEL_CODE (16 MiB)
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// 0xFFFFFFFF 90000000 - 0xFFFFFFFF 9FFFFFFF : KERNEL_STACK (256 MiB)
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class VirtualMemory {
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public:
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enum MemoryType {
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UNSPECIFIED,
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UNMAPPED,
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USER_CODE,
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USER_HEAP,
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MEM_MAP,
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IPC_BUF,
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USER_STACK,
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HHDM,
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KERNEL_HEAP,
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KERNEL_CODE,
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KERNEL_STACK,
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};
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static VirtualMemory ForRoot();
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VirtualMemory();
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VirtualMemory(const VirtualMemory&) = delete;
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VirtualMemory(VirtualMemory&&) = delete;
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uint64_t cr3() { return cr3_; }
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// User Mappings.
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uint64_t AllocateUserStack();
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uint64_t GetNextMemMapAddr(uint64_t size);
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// Kernel Mappings.
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uint64_t* AllocateKernelStack();
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private:
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VirtualMemory(uint64_t cr3) : cr3_(cr3) {}
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uint64_t cr3_ = 0;
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UserStackManager user_stacks_;
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uint64_t next_memmap_addr_ = 0x20'00000000;
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};
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